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Debug problem

I am using the simulator of the uvision2.
According to the debugger the value of c doesn't change (I am using the serial peripheral) and the debugger never execute the Start_bit = 1; even though the SBUF = 0x46.

char c ;
void SerialPort(void) interrupt 4 using 2
{
      if (RI == 1) {
        c = SBUF;
      if(SBUF==0x46)
        Start_bit = 1;

      RI = 0;
  }
}

Thank you very much

Parents

0 Kobi Hayun over 22 years ago in reply to erik malund

Hi
I finnaly understood that the local variable is changed to zero and didn't stay at zero (which means that it doesn't succcefuly read the SBUF???).
here are all my init values.

    TMOD = 0x20;
    TH1 = 0xFB;          // baud ~19200;
    TR1 = 1;
    SCON = 0x50;
    IE=0x90;
    EA = 1;
    ES = 1;
    REN = 1;
    RI = 0;

void SerialPort(void) interrupt 4 using 2
{
      while(!RI)
      {
       if(ArrLenFlag==0)
       {
        ArrLen = _getkey ();
        ArrLenFlag = 1;
       }
       else
       {
        if(_getkey()=='S')
        {
          Start_bit = 1;
          SaveData(1000);
          SaveData(1000);
        }
        else
        {
        chr = _getkey ();
        SaveData(chr);
        }
       }
       RI = 0;
       TI = 0;
      }
}

Thank you for your help.
Kobi

Reply

0 Kobi Hayun over 22 years ago in reply to erik malund

Hi
I finnaly understood that the local variable is changed to zero and didn't stay at zero (which means that it doesn't succcefuly read the SBUF???).
here are all my init values.

    TMOD = 0x20;
    TH1 = 0xFB;          // baud ~19200;
    TR1 = 1;
    SCON = 0x50;
    IE=0x90;
    EA = 1;
    ES = 1;
    REN = 1;
    RI = 0;

void SerialPort(void) interrupt 4 using 2
{
      while(!RI)
      {
       if(ArrLenFlag==0)
       {
        ArrLen = _getkey ();
        ArrLenFlag = 1;
       }
       else
       {
        if(_getkey()=='S')
        {
          Start_bit = 1;
          SaveData(1000);
          SaveData(1000);
        }
        else
        {
        chr = _getkey ();
        SaveData(chr);
        }
       }
       RI = 0;
       TI = 0;
      }
}

Thank you for your help.
Kobi

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